Bird Word: Diagnostic
Diagnostic: a feature of a bird that helps to distinguish it from other species being observed. It can refer to plumage colour, size, shape, behaviour or call. For example, the call of a Laughing Kookaburra is diagnostic; no other species of kingfisher sounds like it except perhaps the similar Blue-Winged Kookaburra. The colour of a Blackbird distinguishes it from a Grey Shrike Thrush. The size of a pelican sets it apart from a tern or gull. The beak of a thornbill is slender compared with a finch.